HIV integrase is the enzyme responsible for transferring the DNA encoded by HIV to host chromosomes, a necessary step for the replication of retroviruses. Raltegravir (RAL) is the first integrase inhibitor approved for HIV treatment of patients infected by this virus. RAL has demonstrated a marked antiretroviral activity against HIV strains resistant to other antiretroviral drug families and high virological efficacy in patients pre-treated so as naïve to antiretroviral treatment. In addition, its safety profile is very favourable.

Unlike what happens with other antiretrovirals such as protease inhibitors, there is not a relationship between the virological response to antiretroviral treatment with RAL and the trough concentration of drug in plasma. Similarly, in vitro studies have shown that, after infection of cultured cells, the rate of viral replication measured by p24 antigen production was continuing inhibited even when RAL was washed from the culture medium from the 8 hours after infection, suggesting the possibility of a post-antibiotic effect of the drug. Either way, as in the case of transcriptase inhibitor nucleoside analogues, this lack of correlation between pharmacokinetics and pharmacodynamics of RAL may only be the result of intracellular accumulation of drug in blood lymphocytes peripheral, which in turn could be explained either by setting the RAL to the pre-integration complex or through the saturation of certain cellular transporters responsible for pumping the RAL from the inside out-cell (efflux transporters). Anyway, the result would be a greater RAL intracellular half-life than plasmatic, which would translate into a clinically persistent antiretroviral effect compared with its concentration in plasma.

Based on the above is possible to suggest that the average life of RAL was longer in the peripheral blood lymphocytes than in plasma, and that this intracellular increased half-life could explain the absence of relationship between trough RAL concentration and its virological efficacy, post-antibiotic effect of RAL found in some studies in vitro which, on the other hand, could be relevant to the possible once-daily administration of raltegravir.

Eligibility

Ages Eligible for Study:

18 Years to 65 Years

Genders Eligible for Study:

Both

Accepts Healthy Volunteers:

No

Criteria

Inclusion Criteria:

Age > 18 years.

HIV documented infection.

Stable antiretroviral treatment for at least 4 weeks.

HIV viral load in plasma <50 copies / mL for at least 12 weeks

Voluntary written informed consent.

Exclusion Criteria:

AIDS-defining illness in the previous 4 weeks

Suspicion of inadequate adherence to antiretroviral therapy

In the case of women, pregnant or breastfeeding, or non-use of contraceptives

History or suspicion of failure to cooperate adequately

Concomitant therapy in the two weeks prior to inclusion in the study with atazanavir, tenofovir, NNRTI, rifampicin, inhibitors of proton pump or other drugs with known interactions with raltegravir.

Contacts and Locations

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study.
To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below.
For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00995241

Locations

Spain

Hospital Germans Trias i Pujol

Badalona, Barcelona, Spain, 08916

Hospital de la Santa Creu i Sant Pau

Barcelona, Spain, 08025

Sponsors and Collaborators

Germans Trias i Pujol Hospital

Investigators

Principal Investigator:

Jose Molto, MD,PhD

Germans Trias i Pujol Hospital

Principal Investigator:

Marta Valle, MD,PhD

Fundació Institut de Recerca de l'Hospital de la Santa Creu i Sant Pau